refactor: return Ok(None) instead of error if sol egress witnessing cannot find a tx

[MxmUrw]

Pull Request

Closes: PRO-1615

Checklist

Please conduct a thorough self-review before opening the PR.

• I am confident that the code works.
• I have written sufficient tests.
• I have written and tested required migrations.
• I have updated documentation where appropriate.

Summary

Some time ago we've made the return value of the vote() function optional (PRO-1979). If the voter logic gets this value it doesn't vote for this election. It is going to try to vote again on the next SC block because is_vote_desired() returns Ok(true) for the ExactValue ES that's used by SolanaEgressWitnessing.

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
engine/src/witness/sol/egress_witnessing.rs	0%	2 Missing ⚠️

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